original from 1913. on this side, we have all the relays that actually control the elevator. the safety service -- city circuit, position, speed, and control of the power to the motor. >> here is a really interesting piece of historic machinery. tell us about this. >> this is one of the main safety devices of the elevator system, and the device still exists today even on modern elevators. it detects if the elevator is going into unsafe over speed conditions. it is attached to the road itself, and the car over speeds, bees fly balls would come out, and the governor jobs would come out and grab on to the governor wrote, which would hold the break or the safety on the elevator to cause it to stop. >> if you have problems, i see right here, we call garfield 7171 for service.